Modification of sulfur cathode by CeO2-C composite hollow spheres and research on electrochemical performance
LI Neng1, QIN Bihui1, HUANG Suping2, XIAO Qi1
1. School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China; 2. State Key laboratory of Powder Metallurgy, Central South University, Changsha 410083, China
Abstract：CeO2-C composite hollow spheres materials were synthesized by solvent-free template method using 3-aminophenol formaldehyde (APF) resin spheres and cerium nitrate hexahydrate (Ce (NO3)3·6H2O) as raw materials. The as-prepared samples were characterized by X-raydiffractometer (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), Fourier infrared spectroscopy (FTIR), etc. In addition, commercial conductive carbon black was used as the sulfur host material, and the prepared CeO2-C composite hollow spheres were used as an additive to modify the sulfur cathode material. The electrochemical performance of the modified sulfur cathode material was tested by cyclic voltammetry (CV), galvanostatic charge-discharge (GCD), electrochemical impedance (EIS), etc. The results show that the sulfur cathodes modified by CeO2-C composite hollow spheres exhibit higher initial discharge capacity of 1 125 mAh/g at 0.2 C, and the lower capacity decay rate of 0.083% per cycle at 1 C after 500 cycles. Using commercial conductive carbon black as sulfur carrier and adding a small amount of CeO2-Ccomposite hollow sphere modifier to prepare sulfur cathode can effectively improve the electrochemical performance of lithium sulfur battery without changing the current preparation process of lithium sulfur battery, showing great application potential.
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2021, Vol. 26 
